SKF - Spherical Plain Bearings and Rod Ends
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<strong>Bearings</strong> <strong>and</strong> rod ends<br />
requiring maintenance<br />
<strong>Bearings</strong> <strong>and</strong> rod ends requiring maintenance<br />
must be greased prior to being put into operation.<br />
With the exception of a few applications,<br />
they must be relubricated periodically.<br />
<strong>SKF</strong> steel/steel radial spherical plain bearings<br />
are made of bearing steel <strong>and</strong> are through-hardened.<br />
The high-strength sliding contact surfaces<br />
are phosphated <strong>and</strong> treated with a special running-in<br />
lubricant. These bearings are used<br />
primarily in applications where there are:<br />
• heavy static loads<br />
• heavy alternating loads<br />
• shock loads<br />
They are also relatively insensitive to contaminants<br />
<strong>and</strong> high temperatures.<br />
To facilitate relubrication, lubrication holes<br />
<strong>and</strong> grooves are provided in both the inner <strong>and</strong><br />
outer rings of all steel/steel radial spherical plain<br />
bearings – with the exception of a few small sizes.<br />
<strong>SKF</strong> steel/bronze rod ends also require relubrication.<br />
However, requirements are less stringent<br />
than for steel/steel rod ends, as the emergency<br />
running properties of bronze are more forgiving<br />
than steel.<br />
The multi-groove system<br />
St<strong>and</strong>ard steel/steel radial spherical plain bearings<br />
that must accommodate minor alignment<br />
movements under very heavy, constant direction<br />
loads are prone to lubricant starvation. To maximize<br />
the effects of the lubricant under these<br />
conditions, <strong>SKF</strong> has developed the multi-groove<br />
system <strong>and</strong> manufactures all metric steel/steel<br />
radial spherical plain bearings with an outside<br />
dia meter D ≥ 150 mm with the multi-groove<br />
system on the sliding surface of the outer ring<br />
as st<strong>and</strong>ard († fig. 8). Metric steel/steel radial<br />
spherical plain bearings with an outside diameter<br />
D < 150 mm can be supplied with the multi-groove<br />
system on request. These bearings<br />
are identified by the designation suffix ESL.<br />
These lubrication grooves provide the following<br />
benefits:<br />
• improved lubricant supply to the loaded zone<br />
• enlarged lubricant reservoir in the bearing<br />
• enable relubrication under load<br />
• extended relubrication intervals<br />
• space for wear particles <strong>and</strong> contaminants<br />
• extended grease life<br />
The main benefit of the multi-groove system<br />
is that it improves lubricant distribution in the<br />
heavily loaded zone to extend service life <strong>and</strong>/or<br />
maintenance intervals.<br />
Fig. 8<br />
Steel/steel radial spherical plain bearing with the multigroove<br />
system<br />
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